Originally Posted by N3LYT
Got to love it, sounds like an early Azdin manual. I have an Azdin 6 meter HT that I almost casually demolished by putting it in damp (on my hip in the rain) but the full blast defroster in the truck fixed it thank God I did not put it in direct sun light that day but I was careful of high temperature.
I have a very nice Tektronix digital multimeter that I once left outside in the rain for a week. When I discovered this, I opened it up, flooded it with distilled water a couple times, and allowed it to dry for a week or so. Amazing! It has worked perfectly ever since.
Back in the day when Tektronix oscilloscopes were all-vacuum-tube instruments and weighed about as much as an M60 main battle tank, if you sent one to Tektronix for repair, the first thing they did was wash it out with a water hose. By removing settled dust that semi-shorted stuff out, this fixed (they said it did, anyway) about 75% of problems. Vacuum-tube circuits, especially low-power ones, have usually pretty high impedance, and a 1MΩ piece of dust in the wrong place could cause real problems.